[Bug 272319] FreeBSD kernel crash on MPD5 restart with PPP configuration.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=272319

--- Comment #4 from Eugene Grosbein <eugen@freebsd.org> ---
I've added some debugging options to my kernel:

options         INVARIANT_SUPPORT
options         INVARIANTS
options         WITNESS
options         WITNESS_KDB

And got more sane panic message:

panic: mtx_lock() of spin mutex (null) @ /usr/src/sys/netgraph/ng_ksocket.c:940

(kgdb) bt
#0  __curthread () at /usr/src/sys/amd64/include/pcpu_aux.h:55
#1  doadump (textdump=<optimized out>) at /usr/src/sys/kern/kern_shutdown.c:371
#2  0xffffffff804c6eef in kern_reboot (howto=260) at
/usr/src/sys/kern/kern_shutdown.c:452
#3  0xffffffff804c7251 in vpanic (fmt=<optimized out>, ap=0xfffffe00184e6280)
    at /usr/src/sys/kern/kern_shutdown.c:881
#4  0xffffffff804c7093 in panic (fmt=<unavailable>) at
/usr/src/sys/kern/kern_shutdown.c:808
#5  0xffffffff804a77a0 in __mtx_lock_flags (c=0xfffff8004da77ba8,
opts=<optimized out>,
    file=0xffffffff807e1b04 "/usr/src/sys/netgraph/ng_ksocket.c", line=940)
    at /usr/src/sys/kern/kern_mutex.c:261
#6  0xffffffff805e1478 in ng_ksocket_shutdown (node=0xfffff8001066f100)
    at /usr/src/sys/netgraph/ng_ksocket.c:940
#7  0xffffffff805db00f in ng_rmnode (node=0xfffff8001066f100, dummy1=<optimized
out>,
    dummy2=<optimized out>, dummy3=<optimized out>) at
/usr/src/sys/netgraph/ng_base.c:757
#8  0xffffffff805dcec9 in ng_apply_item (node=<unavailable>,
item=<unavailable>, rw=1)
    at /usr/src/sys/netgraph/ng_base.c:2477
#9  0xffffffff805e0080 in ngthread (arg=<optimized out>) at
/usr/src/sys/netgraph/ng_base.c:3439
#10 0xffffffff804891c0 in fork_exit (callout=0xffffffff805dfea0 <ngthread>,
arg=0x0,
    frame=0xfffffe00184e6480) at /usr/src/sys/kern/kern_fork.c:1080
#11 <signal handler called>

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